Dual-mode pixel including emissive and reflective devices and dual-mode display with the same
Provided is a dual-mode display including a substrate, and a plurality of sub pixels on the substrate. Each of the sub pixels may include an emissive device, a reflective optical filter provided on a surface of the emissive device, and an optical shutter provided on other surface of the emissive device.
1. A dual-mode display, comprising:
a substrate; and
a plurality of sub pixels on the substrate,
wherein each of the sub pixels comprises:
an emissive device, the emissive device being configured to emit light through two opposite surfaces thereof;
a reflective optical filter provided on a surface of the emissive device; and
an optical shutter provided on another surface of the emissive device.
2. The dual-mode display of claim 1 , wherein the emissive device is an organic light emitting diode.
3. The dual-mode display of claim 2 , wherein the organic light emitting diode comprises
an anode,
a hole injection layer,
a hole transfer layer,
a light emitting layer,
an electron transfer layer,
an electron injection layer, and
a cathode that are sequentially stacked on the substrate.
4. The dual-mode display of claim 1 , wherein the reflective optical filter is one of a Fabry-Perot optical filter, a photonic crystal optical filter, an absorptive optical filter, or a transmissive optical filter with a reflector.
5. The dual-mode display of claim 1 , wherein the optical shutter is operated using one of electrophoresis, electrowetting, electrochromic, or liquid crystal technologies.
6. The dual-mode display of claim 1 , further comprising an intermediate insulating layer interposed between the reflective optical filter and the emissive device.
7. The dual-mode display of claim 6 , wherein the intermediate insulating layer is formed of silica, titanium oxide, or a mixture thereof.
8. The dual-mode display of claim 1 , wherein the reflective optical filter is configured to reflect a fraction of light propagating from the emissive device toward the reflective optical filter.
9. A dual-mode display, comprising:
a substrate; and
a plurality of sub pixels on the substrate,
wherein each of the sub pixels comprises:
a reflective optical filter, the reflective optical filter being one of a Fabry-Perot optical filter, a photonic crystal optical filter, an absorptive optical filter, or a transmissive optical filter with a reflector;
an optical shutter provided on the reflective optical filter; and
an emissive device provided on the optical shutter.
10. The dual-mode display of claim 9 , wherein the emissive device is an organic light emitting diode.
11. The dual-mode display of claim 9 , wherein the optical shutter is operated using one of electrophoresis, electrowetting, electrochromic, or liquid crystal technologies.
12. A dual-mode display, comprising:
a substrate; and
a plurality of sub pixels on the substrate,
wherein the plurality of sub pixels comprises:
a reflective device being one of a MEMS-based reflective device, an electrowetting device, or an electrochromic device; and
a transparent emissive device on the reflective device,
wherein the reflective device serves as an optical filter configured in such a way that color of light reflected thereby is controlled by an electric signal provided from outside the reflective device.
13. The dual-mode display of claim 12 , wherein the transparent emissive device is an organic light emitting diode.
14. The dual-mode display of claim 13 , wherein the organic light emitting diode comprises
an anode,
a hole injection layer,
a hole transfer layer,
a light emitting layer,
an electron transfer layer,
an electron injection layer, and
a cathode that are sequentially stacked on the substrate.
15. The dual-mode display of claim 12 , wherein the emissive device is configured to emit light through two opposite surfaces thereof.
16. The dual-mode display of claim 15 , wherein the reflective device is configured to reflect a fraction of light propagating from the emissive device toward the reflective device.